Time evolution of stimulated Raman scattering and two-plasmon decay at laser intensities relevant for shock ignition in a hot plasma

0582251 - ÚFP 2024 RIV GB eng J - Článek v odborném periodiku
Cristoforetti, G. - Antonelli, L. - Mancelli, D. - Atzeni, S. - Baffigi, F. - Barbato, F. - Batani, D. - Boutoux, G. - D'Amato, F. - Dostál, Jan - Dudžák, Roman - Filippov, E. - Gu, Yanjun - Juha, Libor - Klimo, O. - Krůs, Miroslav - Malko, S. - Martynenko, A.S. - Nicolai, P. - Ospina, V. - Pikuz, S. - Renner, O. - Santos, J. - Tikhonchuk, V.T. - Trela, J. - Viciani, S. - Volpe, L. - Weber, S. - Gizzi, L.A.
Time evolution of stimulated Raman scattering and two-plasmon decay at laser intensities relevant for shock ignition in a hot plasma.
High Power Laser Science and Engineering. Roč. 7, August (2019), č. článku e51. ISSN 2095-4719. E-ISSN 2052-3289
Grant CEP: GA MŠMT EF16_013/0001793; GA MŠMT EF15_003/0000449; GA MŠMT EF16_019/0000789; GA MŠMT EF16_013/0001793; GA MŠMT LTT17015; GA MŠMT(CZ) LM2015083; GA MŠMT EF16_013/0001552
GRANT EU: European Commission(XE) 633053 - EUROfusion
Institucionální podpora: RVO:61389021
Klíčová slova: plasma simulations * shock ignition * stimulated Raman scattering * two-plasmon decay
Obor OECD: Fluids and plasma physics (including surface physics)
Impakt faktor: 2.606, rok: 2019
Způsob publikování: Open access
https://www.cambridge.org/core/journals/high-power-laser-science-and-engineering/article/time-evolution-of-stimulated-raman-scattering-and-twoplasmon-decay-at-laser-intensities-relevant-for-shock-ignition-in-a-hot-plasma/2CDE20F724E6354F16AF759E7A808DA7

Laser-plasma interaction (LPI) at intensities is dominated by parametric instabilities which can be responsible for a significant amount of non-collisional absorption and generate large fluxes of high-energy nonthermal electrons. Such a regime is of paramount importance for inertial confinement fusion (ICF) and in particular for the shock ignition scheme. In this paper we report on an experiment carried out at the Prague Asterix Laser System (PALS) facility to investigate the extent and time history of stimulated Raman scattering (SRS) and two-plasmon decay (TPD) instabilities, driven by the interaction of an infrared laser pulse at an intensity with a scalelength plasma produced from irradiation of a flat plastic target. The laser pulse duration (300 ps) and the high value of plasma temperature () expected from hydrodynamic simulations make these results interesting for a deeper understanding of LPI in shock ignition conditions. Experimental results show that absolute TPD/SRS, driven at a quarter of the critical density, and convective SRS, driven at lower plasma densities, are well separated in time, with absolute instabilities driven at early times of interaction and convective backward SRS emerging at the laser peak and persisting all over the tail of the pulse. Side-scattering SRS, driven at low plasma densities, is also clearly observed. Experimental results are compared to fully kinetic large-scale, two-dimensional simulations. Particle-in-cell results, beyond reproducing the framework delineated by the experimental measurements, reveal the importance of filamentation instability in ruling the onset of SRS and stimulated Brillouin scattering instabilities and confirm the crucial role of collisionless absorption in the LPI energy balance.
Trvalý link: https://hdl.handle.net/11104/0350347